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Our award-winning, patented, Mainline fullport backwater valves have clear plastic tops so you can visually inspect for blockage BEFORE problems arise!
Model # PE 2013
Valve Access Box
The overall width of the open base of the black PE 2013 Access Box is 14-7/8" X 20" and steps down to 11-1/8" X 14-7/8" at the top of its 16" height. The removable gray high density polyethylene (plastic) top access panel is 10-7/8" X 14-1/2". The access box top is held in place by two 1/4" Plastic Push Fasteners.
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These Older Mainline Model # 4963 A (ABS) & Model # 4963 P (PVC) full port backwater valves can be retrofit with the TOP CHECK CONVERSION KIT to convert them into Top Check Valves.  Clear Top for easy visual inspection.
Fullport (normally open) non flow-restricting design. It's virtually self-cleaning! No problems with Blockages. Gate closes automatically when sewer starts to back up Built in main sewer cleanout. Cleaning rods do not destroy the gate when feeding or retrieving cleanout cables. Normally open design allows the free circulation of air throughout the plumbing system to the municipal sewer system. New, Award-Winning Technology. Affordable building drain backup protection. Backwater Valve US Patent # 5406972 Backwater Valve Dimensions: Width: 10" (254 mm), Length: 15.5" (394 mm), Height: 11" ( 280 mm ).
Cutaway view of our Model # 4963
main line full port back water valve
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